Other Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 2021

Statement of Comprehensive Income [Abstract]

Reclassification Out of Accumulated Other Comprehensive Income (Loss)

The following table details reclassifications out of AOCI and into Net income. The amounts in parentheses below indicate decreases to Net income in the Condensed Consolidated Statements of Income for the period (in thousands):


	Location on the Condensed Consolidated Statements of Income	Amount Reclassified from AOCI
		Three Months Ended September 30,				Nine Months Ended September 30,
		2021		2020		2021		2020
Gains and (losses) on cash flow hedges:
Interest rate swaps	Interest expense incurred net of amounts capitalized (including amortization of debt issuance costs, premiums and discounts)	$	(712)	$	(712)	$	(2,138)	$	(2,138)
Commodity contracts	Fuel, purchased power and cost of natural gas sold	331		(178)		356		(734)
		(381)		(890)		(1,782)		(2,872)
Income tax	Income tax (expense)	(26)		209		308		680
Total reclassification adjustments related to cash flow hedges, net of tax		$	(407)	$	(681)	$	(1,474)	$	(2,192)

Amortization of components of defined benefit plans:
Prior service cost	Operations and maintenance	$	25	$	24	$	74	$	79
Actuarial gain (loss)	Operations and maintenance	(598)		(597)		(1,793)		(1,791)
		(573)		(573)		(1,719)		(1,712)
Income tax	Income tax (expense)	133		143		492		407
Total reclassification adjustments related to defined benefit plans, net of tax		$	(440)	$	(430)	$	(1,227)	$	(1,305)
Total reclassifications		$	(847)	$	(1,111)	$	(2,701)	$	(3,497)

Schedule of Accumulated Other Comprehensive Income (Loss)

Balances by classification included within AOCI, net of tax on the accompanying Condensed Consolidated Balance Sheets were as follows (in thousands):


	Derivatives Designated as Cash Flow Hedges
	Interest Rate Swaps		Commodity Derivatives		Employee Benefit Plans		Total
As of December 31, 2020	$	(12,558)	$	2	$	(14,790)	$	(27,346)
Other comprehensive income (loss)
before reclassifications	—		5,476		—		5,476
Amounts reclassified from AOCI	1,743		(269)		1,227		2,701
As of September 30, 2021	$	(10,815)	$	5,209	$	(13,563)	$	(19,169)

	Derivatives Designated as Cash Flow Hedges
	Interest Rate Swaps		Commodity Derivatives		Employee Benefit Plans		Total
As of December 31, 2019	$	(15,122)	$	(456)	$	(15,077)	$	(30,655)
Other comprehensive income (loss)
before reclassifications	—		181		55		236
Amounts reclassified from AOCI	1,630		562		1,305		3,497
As of September 30, 2020	$	(13,492)	$	287	$	(13,717)	$	(26,922)